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Celaenia excavata
This spider looks like a bird dropping. I looked very close at this spider and decided it was. Then it moved.
Spider #2a http://www.brisbaneinsects.com/brisbane_...
I recently found a small moth that looked exactly like bird dropping - I googled the description & found I had spotted an 'exposed bird dropping moth'!
I applied the same science on your spider!
This creature is about 2 cm wide but the legs are much longer and I didn't disturb it to check its full size.